Steam Cooking Vessel
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A slow cooker consists of a lidded round or oval cooking pot made of glazed ceramic or porcelain, surrounded by a housing, usually metal, containing a thermostatically controlled electric heating element. The lid is often transparent glass and is seated in a groove in the pot edge; condensed vapor collects in that groove and provides a low-pressure seal to the atmosphere.
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Government Printing Office The Official Gazette of the United States Patent Office (Washington, DC: Government Printing Office, 1895)
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